|Publication number||US8057523 B2|
|Application number||US 12/178,412|
|Publication date||Nov 15, 2011|
|Filing date||Jul 23, 2008|
|Priority date||Jul 23, 2008|
|Also published as||US20100023063|
|Publication number||12178412, 178412, US 8057523 B2, US 8057523B2, US-B2-8057523, US8057523 B2, US8057523B2|
|Inventors||Eric Daniel Densford, Jim Michael Mirda, Christopher M. Patterson|
|Original Assignee||Warsaw Orthopedic, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (12), Referenced by (5), Classifications (5), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present application is directed to set screws used for use with fasteners to attach an elongated member to a bone and, more particularly, to set screws with a deformable member that increases the contact with the elongated member to prevent back-out of the set screw from the fastener and/or damage to the elongated member.
Set screws are often used with fasteners to attach an elongated member to a bone within a patient. Examples of fasteners include but are not limited to multi-axial screws, fixed-angle screws, and offset screw connectors. The fasteners may include a receiver with a receptacle to receive the elongated member, and an anchor (e.g., screw, hook) that attaches to the bone. The fasteners may be constructed as a single piece, or may include multiple pieces that are attached together such as a multi-axial screw that includes a receiver body that attaches to a head of bone screw. The elongated member fits within the receptacle of the receiver, and the set screw attaches to the receiver to prevent escape of the elongated member. The set screw may also apply a force to the elongated member to maintain the attachment within the receiver. The fasteners may be configured to receive a variety of different elongated members, including but not limited to rods, cables, and wires.
Often times the receiver is configured to allow the elongated member to be positioned at a variety of angles within the receptacle. This is problematic as the set screw does not fully contact against the elongated member. This may lead to the loosening of the set screw from the receiver and/or backing out of the set screw from the receiver. Additionally, this incomplete contact may damage the elongated member and causing notching or deformation.
The present application is directed to set screws used with fasteners to capture and engage an elongated member. The set screws include a body sized to attach to a receiver of the fastener. A deformable member may be attached to an end of the set screw and provides for the set screw to more fully engage the elongated member and secure it within the receiver. The deformable member may also prevent potential damage to the elongated member and prevent the set screw from backing out of the fastener. In one embodiment, just the deformable member contacts the elongated member. In another embodiment, the deformable member and the body contact the elongated member. In yet another embodiment, a contact member is attached to the deformable member to contact against the elongated member.
The various aspects of the various embodiments may be used alone or in any combination, as is desired.
The present application is directed to set screws for use with fasteners for attaching an elongated member to a bone within a patient. The set screws engage with the elongated member to capture and secure the elongated member within a receptacle of the fastener.
The set screw 10 may be used in various types of fasteners 140.
The fastener 140 of
The set screw 10 attaches to the receiver 150 to capture and secure the elongated member 100 within the channel 153. The set screw 10 includes a body 20 sized to fit between and engage the uprights 152. In the embodiment of
Various elements may extend outward from the second end 22 to facilitate attachment with the member 40 and/or contact with the elongated member 100. These elements may be attached with the body 20, or may be formed with the body 20 (i.e., the body and element(s) are of a one-piece unitary construction).
A sidewall 24 may also extend outward from the second end 22 of the body 20. As illustrated in
Body 20 may be constructed from various elements, including but not limited to titanium, cobalt-chrome, and stainless steels.
The member 40 is attached to the second end 22 to facilitate the engagement between the set screw 10 and the elongated member 100. Member 40 is made from a superelastic material that allows for deformation around the elongated member 100. This deformation allows the set screw 10 to more fully capture the elongated member 100 and prevent the set screw 10 from backing out of the receiver 150. The deformation and more complete contact may also protect the elongated member 100 against notching and deformation. In one embodiment, member 40 is made from polyetheretherketone (PEEK). Member 40 may also be made from other materials including but not limited to polyetherketone (PEK), polyaryletherketone (PAEK), silicone, BIONATE thermoplastic polycarbonate urethane, styrene-butadiene, polyisoprene, and combinations thereof. Member 40 may be attached to the body 20 in a variety of different manners including but not limited to molding, snap fit, and adhesives. In one embodiment, the member 40 is attached to prevent rotation relative to the body 20.
Member 40 may include various shapes and sizes. Member 40 includes a first side 41 that faces towards the body 20 and a second side 42 that faces away from the body 20. An aperture 43 may extend through the member 40 and be positioned to receive the extension 30. The size of the aperture may closely approximate the size of the extension 30, or may be substantially larger than the extension 30 thus forming a gap between the member 40 and extension 25. A thickness of the member 40 measured between the first and second sides 41, 42 may be substantially the same throughout as illustrated in
In one embodiment, member 40 is attached to the body 20 such that only the member 40 contacts the elongated member 100.
In another embodiment, a combination of the member 40 and extensions 30 and/or sidewall 24 contact the elongated member 100.
The member 40 may also be positioned away from the elongated member 100.
The contact member 50 may be constructed from various materials, including titanium, stainless steels, cobalt-chrome, and various polymers. The contact member 50 may be constructed from the same or a compatible material with the elongated member 100 to give the set screw a better interface.
The embodiments of
In use, the fastener 140 is attached to the bone 300 and the elongated member 100 is positioned within the channel 153. The set screw 10 is attached to the receiver 150 and moved into contact with the elongated member 100. The set screw 10 prevents the elongated member 100 from escaping from the channel 153, and also applies a force to secure the elongated member 100 to the receiver 150. The deformable member 40 causes a portion of the set screw 10 to deform around the elongated member 100 to increase an amount of surface area that is in contact with the elongated member. Additionally, the elongated member 100 may not be fully seated within the channel 153 due to the angle the elongated member 100 extends along the bone 300 and the position of the fastener 140. The deformation of the set screw 10 accommodates this positioning and again increases the amount of surface area that the set screw 10 contacts against the elongated member 100. Additionally, this deformation also normalizes the forces applied through the set screw 10 to the elongated member 100 to secure the elongated member 100 in the channel 153.
The elongated member 100 may be constructed from a variety of surgical grade materials. These include metals such as stainless steels, cobalt-chrome, titanium, and shape memory alloys. Non-metallic rods, including polymer rods made from materials such as PEEK and UHMWPE, are also contemplated. The elongated member 100 may be straight, curved, or comprise one or more curved portions along its length.
Spatially relative terms such as “under”, “below”, “lower”, “over”, “upper”, and the like, are used for ease of description to explain the positioning of one element relative to a second element. These terms are intended to encompass different orientations of the device in addition to different orientations than those depicted in the figures. Further, terms such as “first”, “second”, and the like, are also used to describe various elements, regions, sections, etc and are also not intended to be limiting. Like terms refer to like elements throughout the description.
As used herein, the terms “having”, “containing”, “including”, “comprising” and the like are open ended terms that indicate the presence of stated elements or features, but do not preclude additional elements or features. The articles “a”, “an” and “the” are intended to include the plural as well as the singular, unless the context clearly indicates otherwise.
The present invention may be carried out in other specific ways than those herein set forth without departing from the scope and essential characteristics of the invention. In one embodiment, the member 40 includes a greater thickness than contact member 50. In one embodiment, the extension 30 includes a length equal to a thickness of the member 40 and the contact member 50. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, and all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US936549 *||Dec 28, 1908||Oct 12, 1909||Charles G Lundholm||Set-screw.|
|US1107077||May 10, 1913||Aug 11, 1914||Charles A Kenworthy||Combination-square.|
|US3479072||Jun 20, 1966||Nov 18, 1969||John Kosar||Positive locking,nonmarring set screw|
|US3501993||Dec 17, 1968||Mar 24, 1970||Swenson Henry F||Setscrew with rotatable plastic end|
|US3645161||Nov 18, 1969||Feb 29, 1972||Pic Design Corp||Solder tip setscrew|
|US4671716||Apr 4, 1986||Jun 9, 1987||Alfred Grass Gmbh Metallwarenfabrik||Locking screw for the adjustable connection of a hinge strap|
|US6116832||Aug 19, 1997||Sep 12, 2000||Woco Franz-Josef Wolf & Co.||Screw with elastomer component to provide vibrational decoupling|
|US6960212||Sep 18, 2002||Nov 1, 2005||Aesculap Ii, Inc.||Rod to rod connector|
|US7320570||Feb 15, 2005||Jan 22, 2008||Czarnek And Orkin Laboratories, Inc.||Set screw with NiTi tip|
|US7516991 *||May 20, 2008||Apr 14, 2009||Donell Optronics Co., Ltd.||Pipework with a fastening device|
|US20030185648||Mar 5, 2003||Oct 2, 2003||Blaess Donald J.||Set screw with rotating point|
|US20050180839||Feb 15, 2005||Aug 18, 2005||Czarnek And Orkin Laboratories, Inc.||Set screw with NiTi Tip|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US9271742||Jul 15, 2013||Mar 1, 2016||Wilson Theophilo Asfora||System for joint fusion|
|US9271743||Jul 15, 2013||Mar 1, 2016||Wilson Theophilo Asfora||System for joint fusion|
|US9295488||Aug 9, 2012||Mar 29, 2016||Wilson T. Asfora||Joint fusion|
|US9510868||May 31, 2013||Dec 6, 2016||Biedermann Technologies Gmbh & Co. Kg||Polyaxial bone anchoring device|
|US9526548||Feb 26, 2014||Dec 27, 2016||Asfora Ip, Llc||System for joint fusion|
|U.S. Classification||606/308, 606/270|
|Jul 24, 2008||AS||Assignment|
Owner name: WARSAW ORTHOPEDIC, INC., INDIANA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MIRDA, JAMES MICHAEL;DENSFORD, ERIC DANIEL;PATTERSON, CHRISTOPHER M.;REEL/FRAME:021320/0699
Effective date: 20080722
|May 15, 2015||FPAY||Fee payment|
Year of fee payment: 4